Hydronic Gas Boiler Assembly CGa-3 Natural Gas Series-3 67,000 BTU Atmospheric Chimney-Vent Hot-Water Heating Unit WM-381359072

The Hydronic Gas Boiler Assembly CGa-3 Natural Gas Series-3 67,000 BTU Atmospheric Chimney-Vent Hot-Water Heating Unit (WM-381359072) delivers dependable cast-iron performance for smaller hydronic heating systems requiring traditional atmospheric draft. With an input of approximately 67,000 BTU and an 84 percent AFUE rating, the CGa-3 uses a PIDN ignition module for consistent burner lighting and safe sequencing during operation. The chimney-vent design integrates with standard B-vent or masonry chimneys and relies on proper natural draft to remove combustion gases, making vent height and termination critical to installation success. Technicians should confirm the chimney is unobstructed and correctly sized, verify rollout and spill-switch operation, check manifold gas pressure, and match piping to the CGa-3’s designated supply and return tappings to maintain stable circulation and temperature control.